xtekky/gpt4free · error · Exception

Failed to solve 'gAAAAAB' challenge

Error message

Failed to solve 'gAAAAAB' challenge

What it means

Raised when g4f cannot solve OpenAI/ChatGPT's proof-of-work 'gAAAAAB' challenge. generate_answer() brute-forces up to 500,000 sha3_512 hashes (new.py:434) trying to find one whose digest prefix is <= the difficulty target sent by the server; if none is found it returns solved=False and this exception is thrown. It almost always means OpenAI changed the challenge/config format or issued a difficulty too high for the attempt budget.

Source

Thrown at g4f/Provider/openai/new.py:414

        "location",
        random.choice(window_keys),
        time.perf_counter(),
        str(uuid.uuid4()),
        "",
        8,
        int(time.time()),
    ]

    return config


def get_answer_token(seed, diff, config):
    answer, solved = generate_answer(seed, diff, config)

    if solved:
        return "gAAAAAB" + answer
    else:
        raise Exception("Failed to solve 'gAAAAAB' challenge")


def generate_answer(seed, diff, config):
    diff_len = len(diff)
    seed_encoded = seed.encode()
    p1 = (
        json.dumps(config[:3], separators=(",", ":"), ensure_ascii=False)[:-1] + ","
    ).encode()
    p2 = (
        ","
        + json.dumps(config[4:9], separators=(",", ":"), ensure_ascii=False)[1:-1]
        + ","
    ).encode()
    p3 = (
        "," + json.dumps(config[10:], separators=(",", ":"), ensure_ascii=False)[1:]
    ).encode()

    target_diff = bytes.fromhex(diff)

View on GitHub (pinned to 973504e177)

Solutions

1. Upgrade g4f to the latest version (pip install -U g4f) so the PoW solver matches the current challenge format
2. Retry the request: challenges vary per session and a retry often draws a solvable difficulty
3. Route via a residential proxy or different IP to receive an easier difficulty
4. Switch to another working provider while OpenAI's challenge format is in flux

Example fix

// before
answer = get_answer_token(seed, diff, config)  # raises on hard challenge

// after
from g4f.Provider.openai.new import get_answer_token
try:
    answer = get_answer_token(seed, diff, config)
except Exception:
    answer = get_answer_token(seed, diff, build_config())  # rebuild config and retry once

try:
    token = get_answer_token(seed, diff, config)
except Exception:
    # challenge difficulty varies per session; rebuild config and retry once, then give up
    token = get_answer_token(seed, diff, build_config())

When it happens

Trigger: Calling OpenaiChat generation when the server returns a PoW challenge whose 'difficulty' hex string is unusually long/hard, or whose config array shape changed so the hashed p1/p2/p3 segments no longer match what the server verifies; the loop at new.py:434 exhausts maxAttempts=500000 without hash_value[:diff_len] <= target_diff.

Common situations: OpenAI deploys a new chat-requirements payload schema; running an outdated g4f snapshot against a changed sentinel/PoW endpoint; hard challenges (4-byte+ difficulty) served to suspicious IPs; proxies/datacenter IPs getting tougher difficulty.

Related errors

• Failed to solve 'gAAAAAC' challenge
• Error processing token {token}: {exc}
• Failed to chat: {response.status} {error_text}
• Failed to decode JSON from PhindAi response: {text}
• PhindAi API returned success=False: {data}

AI-assisted analysis of xtekky/gpt4free@973504e177 (2026-08-14). Data as JSON: /api/errors/293aeed8d25cce1c. Report an issue: GitHub.